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Passing through to Dropwizard’s Console Reporter
This guide shows how to plug in less commonly used Dropwizard Reporter
implementations — in this case, the ConsoleReporter
.
@Bean
public MetricRegistry dropwizardRegistry() {
return new MetricRegistry();
}
@Bean
public ConsoleReporter consoleReporter(MetricRegistry dropwizardRegistry) {
ConsoleReporter reporter = ConsoleReporter.forRegistry(dropwizardRegistry)
.convertRatesTo(TimeUnit.SECONDS)
.convertDurationsTo(TimeUnit.MILLISECONDS)
.build();
reporter.start(1, TimeUnit.SECONDS);
return reporter;
}
@Bean
public MeterRegistry consoleLoggingRegistry(MetricRegistry dropwizardRegistry) {
DropwizardConfig consoleConfig = new DropwizardConfig() {
@Override
public String prefix() {
return "console";
}
@Override
public String get(String key) {
return null;
}
};
return new DropwizardMeterRegistry(consoleConfig, dropwizardRegistry, HierarchicalNameMapper.DEFAULT, Clock.SYSTEM) {
@Override
protected Double nullGaugeValue() {
return null;
}
};
}
Note that, in a Spring environment, this registry is added to other implementations in a composite and is used for all metrics, both custom and auto-configured.
class MyComponent {
private final MeterRegistry registry;
public MyComponent(MeterRegistry registry) {
this.registry = registry;
}
public void doSomeWork(String lowCardinalityInput) {
registry.timer("my.latency", "input", lowCardinalityInput).record(() -> {
// do work
});
}
}
The following listing shows typical output for this custom timer:
3/2/18 10:14:27 AM =============================================================
-- Timers ----------------------------------------------------------------------
myLatency.lowCardinalityInput.INPUT
count = 1
mean rate = 1.02 calls/second
1-minute rate = 0.00 calls/second
5-minute rate = 0.00 calls/second
15-minute rate = 0.00 calls/second
min = 100.00 milliseconds
max = 100.00 milliseconds
mean = 100.00 milliseconds
stddev = 0.00 milliseconds
median = 100.00 milliseconds
75% <= 100.00 milliseconds
95% <= 100.00 milliseconds
98% <= 100.00 milliseconds
99% <= 100.00 milliseconds
99.9% <= 100.00 milliseconds